| 鄂尔多斯盆地深部富铀烃源岩提供铀源可能性的实验研究 |
| |
| 引用本文： | 王苗,吴柏林,李艳青,刘池阳,郝欣,刘明义,张婉莹,李琪,姚璐航,张效瑞. 鄂尔多斯盆地深部富铀烃源岩提供铀源可能性的实验研究[J]. 地球科学, 2022, 47(1): 224-239. DOI: 10.3799/dqkx.2021.050 |
| |
| 作者姓名： | 王苗 吴柏林 李艳青 刘池阳 郝欣 刘明义 张婉莹 李琪 姚璐航 张效瑞 |
| |
| 作者单位： | 西北大学大陆动力学国家重点实验室, 陕西西安 710069 |
| |
| 基金项目： | 中国地质调查局项目(Nos.12120115013501,12120114009201,DD20211550);辽河油田公司科技项目(No.2021JK-07-3);国家基础科学人才培养基金项目(No.XDCX2020-08)。 |
| |
| 摘 要： | 鄂尔多斯盆地上三叠统延长组长7段石油优质烃源岩以富铀为特色,而盆地侏罗?白垩纪地层以赋存大量砂岩型铀矿而著称.为探索深部长7富铀烃源岩为浅部砂岩型铀矿形成提供铀源的可能性,选择盆地南部的富铀烃源岩、油样以及具有代表性的碳酸铀酰作为反应物,在中?高温高压还原条件下分别进行烃源岩生排烃?排铀模拟实验和油?铀关系模拟实验.结...
|
| 关 键 词： | 鄂尔多斯盆地 富铀烃源岩 砂岩型铀矿 模拟实验 铀源 铀迁移形式 矿床学 |
| 收稿时间： | 2021-01-04 |
Experimental Study on Possibility of Deep Uranium-Rich Source Rocks Providing Uranium Source in Ordos Basin |
| |
| Wang Miao,Wu Bailin,Li Yanqing,Liu Chiyang,Hao Xin,Liu Mingyi,Zhang Wanying,Li Qi,Yao Luhang,Zhang Xiaorui. Experimental Study on Possibility of Deep Uranium-Rich Source Rocks Providing Uranium Source in Ordos Basin[J]. Earth Science-Journal of China University of Geosciences, 2022, 47(1): 224-239. DOI: 10.3799/dqkx.2021.050 |
| |
| Authors: | Wang Miao Wu Bailin Li Yanqing Liu Chiyang Hao Xin Liu Mingyi Zhang Wanying Li Qi Yao Luhang Zhang Xiaorui |
| |
| Affiliation: | (State Key Laboratory of Continental Dynamics,Northwest University,Xi’an 710069,China) |
| |
| Abstract: | The high quality source rocks of the Chang 7 Member in Yanchang Formation of the Upper Triassic in the Ordos Basin are characterized by uranium enrichment,while the Jurassic-Cretaceous strata of the basin are famous for hosting a large number of sandstone-type uranium deposits.To analyze the possibility of source rocks providing uranium source for shallow sandstone type uranium deposits,the uranium-rich source rocks,oil samples from the Chang 7 Member and representative uranyl carbonate were selected as reactants,and simulation experiments of hydrocarbon generation and expulsion of uranium from source rocks and oil-uranium relationship were carried out respectively under the reduction conditions of medium-high temperature and high pressure.The results show that uranium can be discharged along with the process of hydrocarbon expulsion from source rock,and the increase of temperature and pressure at 30-200℃and 2-5 MPa is conductive to the increase of hydrocarbon generation and uranium discharge.The discharged rate of uranium increases with the increase of hydrocarbon generation and is generally 55%-75%.Among them,the proportion of soluble uranium from itself is about 12%,and the discharged rate of uranium caused by the superposition of hydrocarbon generation is 43%-48%.The uranium migration forms found in this experiment are special,such as tetravalent(UO2),hexavalent(UO3),mixed valence(U3O8)and hydrate colloid form(UO3·H2O,U6O7(OH)2O),which are mainly adsorbed by low-temperature oil-gas fluid,and the uranium adsorption capacity shows an increasing trend with the increase of temperature and the decrease of pressure.Thus,it is beneficial for uranium ore formation when low temperature uranium-bearing oil-hydrothermal fluids migrate to shallow strata.Based on the above analyses,it is considered that the source rocks of Chang 7 Member in the southern Ordos Basin can release or discharge a large amount of uranium,which can be adsorbed by low-temperature oil-gas in the form of tetravalent,hexavalent and mixed valence.Subsequently,the adsorbed uranium moves upwards along with the oil-water fluid through the fracture,providing partial material source for the formation of shallow sandstone-type uranium deposits of the basin. |
| |
| Keywords: | Ordos Basin uranium-rich source rock sandstone-type uranium deposit simulation experiment uranium source uranium migration form mineral deposit |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《地球科学》浏览原始摘要信息 |
|
点击此处可从《地球科学》下载免费的PDF全文 |
|
